Anchor chuck and anchor



March 3, `1964 c. J. UNANDER 3,123,370

ANCHOR CHUCK AND ANCHOR Filed March 29, 1961 United States PatentUtilice 3,123,370 Patented Mar. 3, 1964 3,123,370 ANCHOR CHUCK ANDANCHOR Clarence J. Unander, 824 N. Vail Ave., Arlington Heights, Ill.Filed Mar. 29, 1961, Ser. No. 99,234 2 Claims. (Cl. 279-82) Thisinvention relates to an article holder and more particularly to achucking device for holding self-drilling expansion type anchors.

A primary object or this invention is to provide a chuck for aself-drilling expansion anchor that positively locks the anchor thechuck and permits easy ejection of the anchor shank after the anchorsetting operation is completed, without the use of a separate ejection`tool.

Another object is to provide -a chuck as defined in the precedingparagraph having a body with an axial right cylindrical socket, and alocking lug slidably mounted in the body radially of the socket toselectively engage a groove in the anchor to preclude axial movementbetween the anchor land the socket with an outer sleeve slidablelongitudinally on the lbody of the chuck to engage the locking lug andforce it into locking engagement with the anchor, and to provide meansfor capturing the sleeve in a position whereby the anchor is locked inthe chuck socket.

Another object of the invention is to provide a chuck as defined in thepreceding paragraph in which a second lug engages a tool groove toprevent relative rotation of the tool.

Still another object of the invention is to provide an anchor having apair of longitudinally and circumferentially spaced grooves in astraight cylindrical chucking end to engage chuck lugs Aand lock theanchor adjant relative movement. v

Further features and advantages of this invention will become apparentfrom the following detailed description taken in connection with theaccompanying drawings in which:

FIGURE l -is an elevational ing the invention;

FIGURE 2 is an end elevational view of the chuck;

FIGURE 3 is a horizontal sectional view of the chuck taken substantiallyalong the line 3 3 of FIGURE 2 with an anchor shown in broken line;

`FlG'URE 4 is a horizontal sectional view of the chuck takensubstantially along the line 44 of FIGURE 2;

FIGURE 5 is similar to FIGURE 3 but showing the outer sleeve in aretracted position with an anchor in position for insertion in thechuck;

FIGURE 6 is `a similar to FlGURE 4 but showing the outer sleeve in -aretracted posit-ion with an anchor inserted in the chuck;

FIGURE 7 `is an elevational View associated plug; and

FIGURE 8 is an end view of the anchor.

While this invention is susceptible of embodiment in many differentforms, there is shown in the drawings and will herein be described indetail an embodiment of the invention with the understanding that thepresent disclosure is to be considered as an exemplifi'cation of theprinciples of the invention and is not intended to limit the `inventionto the embodiment illustrated. The scope of the invention will bepointed out in the appended claims.

Referring to the drawings, the chuck device comprises a body 10 having'an axial recess 1'1 at one end which receives an anvil 1=2 in tightengagement therewith which is adapted to fit a percussive type tool (notshown). The other end o-f the body 10 is provided with an axial rightcylindrical socket 113 for receiving a cylindrical shank view of thechuck embodyof the anchor and its of an expansion anchor 14 forembedding in cement and the like. An axial bore 15, of a smallerdiameter than the socket 13A is provided between the socket and therecess 111 and a passageway 16 extends radially from the 'bore 15 to theouter surface of the body for a purpose hereinafter described.

A lug 13 is provided in the socket extending inwardly from the side andadjacent the bottom thereof. Lug 18 cooperates with a grooved notch 19in the end of the expansion anchor 14 when the anchor is inserted intothe socket to prevent relative rotational movement between the anchorand the socket about their axes. A bore 21 located generally midway thelength of the socket, extends radially outward therefrom to the outersurface of the body 10 and receives a locking lug 22 having an inner end22a and an outer end 22b mounted for movement radially of the socket.The outer end 22b has a surface tapered longitudinally of the body andthe inner end 22a defines the locking end of the lug for engagement witha chordal groove Z3 that is provided on the shank of expansion anchor 14to prevent relative longitudinal movement therebetween after the anchorhas been inserted in the socket. The lug 22 is longitudinally spacedfrom the lug 18, 'and preferably 90 apart as apparent in FII'GURE 2 toprevent interference between the lugs and to facilitate their locationon the relatively short socket.

IThe locking member 22 is normally biased to a rst position, -as shownin 5, whereby the outer end 22b projects outward from the outer surfaceof the body 1li and the inner end 22a is substantially fully Within thebody. The biasing means for the locking member 22 includes ra narrowelongated leaf spring 25 which is received by a shallow groove 26located in the outer surface of the body 10. The groove 26 extendslongitudinally and rearwardly from the bore 21 to a point generallymidway the length of the body. A hole 27 extends generallylongitudinally from the rear of the groove, at the bottom thereof andreceives one end of the leaf spr-ing 25, the other end engaging a hole28 in the locking member 22 which is located directly below the mostinwardly tapered portion of end 22b. 'It can be seen from the drawingsthat the bottom surface of the groove 26 has a crown described irstposition, as shown in iFIGURE 5.

An outer sleeve member 29 is slidable longitudinally on the body 1t! andover the tapered surface of the outer end 22b of locking member 22,moving it radially inward and causing the locking member to assume asecond position whereby the inner end 22a projects inwardly in thesocket 13 and' the outer end 22b is substantially fully within the body10, as shown in FIGURE 3. A

FIGURE 5 shows the chucking device in condition for receiving theexpansion anchor 14. The locking member 22 is biased to its rst positionand the sleeve 29 moved rearward from the end of the body to a positionwhereby a leading edge 29a of the sleeve remains over the lowermost edgeof the tapered surface of end 22b to prevent the locking lug 22 fromescaping the hole 21. At least one stop lug 30 extends radially outwardfrom the surface of the body 10 to limit the rearward movement of thesleeve 29 so that a portion of the sleeve will always be over a portionof the outer end 22b and keep the locking lug within the hole 21. Theexpansion anchor 14 is inserted in the socket 13 and positioned so thatthe lug 18 engages the notch 19 in the end of the anchor. The sleeve 29is then moved longitudinally forward toward the end of the body and overthe tapered surface of the outer end 22b forcing locking lug 22 radiallyinward against the urging of spring 25 to its second position wherebythe inner end 22a projects inwardly in the socket 13 and engages thechordal groove 23, locking the anchor in the socket. A snap ring 32 isprovided in a circumferential groove about the body adjacent the endthereof to limit the forward movement of the outer sleeve 29 over theend of body 10.

Means are provided to lock the sleeve 29 in its forward position tomaintain end 22a of locking lug 22 in engagement with groove 23 in theanchor. The means include a recess 33 provided in the surface of thebody 1h extending radiall-y inward and preferably located diametricallyopposite the passageway 16. The recess 33 slidably receives a buttonmember 34 which is biased radially outward by a spring within the recessand has a lip 34a around the periphery thereof. When the sleeve 29 is inits forward position, it is captured between the snap ring 32 and thebutton 34 thereby keeping the locking lug 22 in its second positionwhereby the anchor 14 is locked within the socket. The rear edge of thesleeve 29 is positioned over the lip 34a of button 34 when the sleeve isin its forward position to'retain the button within the recess 33 andprevent its escape therefrom, as shown in FIGURE 4.

When it is desired to remove the anchor 14 from the chucking device, thebutton 34 is depressed radially inward against the urging of the spring35 to place its top surface substantially fully within the body it) andthe sleeve 29 moved rearward over the top surface of the button andagainst the stop 30, thereby maintaining the button 34 substantiallywithin the body, as shown in FlG- URE 6. The rearward movement of thesleeve also allowsy the locking member 22 to assume its first positionand the anchor can be removed from the socket.

The expansion anchor 14 is shown in FIGURES 7 and 8 and may be of anywell known type of self-drilling expansion anchor having an internallongitudinal bore, except that the shank 37 is cylindrical and nottapered and has substantially the same outer diameter as the body 38- ofthe anchor. The grooved notch 19 is transverse the length of the anchorand adjacent the end of the shank. The chordal groove 234 is spacedlongitudinally on the shank from the notch 19 and circumferentiallylocated 90 therefrom so that the notchy and the groove correspond withthe location of the lugs 18 and 22 in the socket 13.

Hardened drill teeth 39 are located at an end of the anchor body 38 fordrilling a hole in concrete and longitudinal grooves 40 andcircumferential ridges 4l are pro vided on an outer surface of the bodyto aid in securing the anchor within the hole.

An annular groove 42 around the circumferential surface of the anchor,between the shank 37 and the body 38 provides a weakened cross sectionof the anchor whereby the shank may be broken olf from the body afterthe anchor setting operation is completed.

When using the chuck and expansion anchor combination, the anvil 12 isconnected to a percussive type power tool (not shown) andthe cylindricalshank 37 of the anchor is locked in the chuck socket 13. A hole isdrilled to a predetermined depth in a concrete surface by operating thepercussive tool to transmit striking force to the end surface 44 of theshank to drive the hardened teeth 36 into the concrete surface as theanchor is rotated. The anchor is then removed from the hole and atapered hardened steel expander plug 43 inserted in the end thereof. Theanchor is again inserted in the hole and the percussive tool operated toforce the anchor over the expander plug and expand the sides of theanchor to tight gripping contact with the sides of the hole. When theanchor has been expanded suiciently, the percussive tool is tilted tobreak off the shank of the anchor at annular groove 42 and the shank iseasily dislodged from the chuck by moving the sleeve 29 rearward,allowing the locking member 22 to move radially outward therebydisengaging the end 22a from the groove 23. In operation, it has beenfound that when the button 34 is depressed, the vibration imparted tothe chuck by the percussive tool is sufficient to cause the sleeve 29 tomove rearward over the button 34 and automatically release the lockinglug 22 from the tool shank and allow the shank to fall out of the chuckof its own accord.

When the hole in the concrete mounting surface is being drilled, thecuttings pass through the internal bore of the expansion anchor andthrough the bores l5 and 16 in the chuck body and are discharged to theatmosphere. Diametrically opposed recesses 43 and 43a are provided inthe chuck body 10 adjacent the anvil 12 for receiving the ends of handlerods (not shown) to turn the chuck body when drilling the hole in theconcrete mounting surface, to facilitate such drilling.

The aforedescribed embodiment of the chucking device has many advantagesover devices now in use that rely on a tapered socket communicating witha tapered shank on the expansion anchor. Since the anchor is locked inthe chuck at all times during the drilling operation, it will not beseparated therefrom even if the chuck face comes in contact with theconcrete when drilling a hole and in the event the anchor binds in thehole, operation of the percussive tool will assist in removing it. Thelocked position of the anchor and the chuck will aiso permit the runningof the percussive tool for cleaning the internal portion of the anchorof cuttings from the concrete without disengaging the anchor from thechuck.

The anchor shank end 44 that receives the force transmitted from thepercussive tool or impact hammer has an outer diameter equal to thediameter of the anchor body 3S and therefore offers considerably moresurface and strength at the point of impact than a tapered shank endwould provide and consequently heavier impact harnmers may be usedwithout concern to distortion or collapse of the shank.

Other advantages are that this type of chuck eliminates a need for anejector key that is required when using a tapered shank anchor sincethere is no wedging or seizing of the tapered end of the anchor in thechuck. Manufacturing ditiiculties encountered in establishing andmaintaining acceptable tolerances for matching tapers on the chuck andon the anchor shank are eliminated. The diameter of the shank iscontrolled by steel industry tolerances, and never changed or varied inmanufacturing. The above advantages greatly facilitate the operation ofsecuring an expansion anchor in a concrete mounting surface.

I claim:

1. An expansion anchor for use in concrete mounting surfaces comprising:a generally cylindrical body with a bore therethrough and a straightcylindrical shank with a continuation of said bore therein defining anannular end for the shank, a notch on an outer surface of the shankadjacent the end thereof and transverse the length of the anchor forreceiving an element to prevent rotational movement of the anchor, achordal groove on the surface of the shank longitudinally andcircurnferentialiy spaced from the notch for receiving an element toprevent axial movement of the anchor, a plurality of hardened teeth onan end of the body for drilling a hole in the concrete, a series ofcircumferential ridges and longitudinalL grooves in an outer surface ofthe body to aid in securing said anchor within said hole, and -acircumferential groove in an outer surface of the anchor between theshank and the body providing a weakened anchor cross section whereby theshank is severed from the body after the anchor is secured in the hole.

2. A cement anchor and chuck combination comprising: a body providedwith an axial right cylindrical socket with a base Wall and a cent-ralpassage, an opening connecting said passage with the exterior of thebody, a hollow anchor having a cylindrical shank fitting said socketwith an annular impact receiving end engaging said base wall, a lug insaid socket and a groove on said tool shank interengageable to preventrelative rotational movement between the tool and the socket, a lockinglug movably mounted in the body radially of the socket, the locking lughaving a first position whereby an `outer end projects beyond the outersurface of the body and an inner end is substantially fully within thebody, an outer sleeve slidable longitudinally on the body and adapted toengage the projecting outer end of the .locking lug and force said lugto a second position by virtue of movement of the sleeve toward an endof the body, whereby the outer end of the locking lug is substantiallyfully within the body and the inner end projects into the socket, saidanchor shank having a chordal groove for selectively receiving the innerend of said locking lug When the locking lug `is in its second positionto preclude relative axial movement between the anchor and the socket,and means to dock the outer sleeve to retain the locking lug in itssecond position, the cuttings formed by the anchor passing through thehollow anchor, central passage and opening to the exterior of the body,said means to retain the locking lug in second position including abutton mounted in the side of the body and biased radially outward tooverlap and retain the outer sleeve in a position toward the end of thebody and over the outer end of the locking lug, said button beingmanually depressible to allow movement of the outer sleeve away from theend of the body and over the button 4whereby said locking sleeve assumesits rst position.

References Cited in the file of this patent UNITED STATES PATENTS1,076,971 Geiger Oct. 28, 1913 1,084,152 Kessell Jan. 13, 19'141,195,350 Gilman Aug. 22, 1916 2,019,332 Atkins Oct. 29, 1935 2,680,636Griin .Tune 8, 1954 2,807,473 Kiehne Sept. 24, 1957 2,926,353 WersteinMar. 1, 1960 2,944,523 Werstein July l2, 1960 2,963,935 Shields Dec. 13,1960

2. A CEMENT ANCHOR AND CHUCK COMBINATION COMPRISING: A BODY PROVIDED WITH AN AXIAL RIGHT CYLINDRICAL SOCKET WITH A BASE WALL AND A CENTRAL PASSAGE, AN OPENING CONNECTING SAID PASSAGE WITH THE EXTERIOR OF THE BODY, A HOLLOW ANCHOR HAVING A CYLINDRICAL SHANK FITTING SAID SOCKET WITH AN ANNULAR IMPACT RECEIVING END ENGAGING SAID BASE WALL, A LUG IN SAID SOCKET AND A GROOVE ON SAID TOOL SHANK INTERENGAGEABLE TO PREVENT RELATIVE ROTATIONAL MOVEMENT BETWEEN THE TOOL AND THE SOCKET, A LOCKING LUG MOVABLY MOUNTED IN THE BODY RADIALLY OF THE SOCKET, THE LOCKING LUG HAVING A FIRST POSITION WHEREBY AN OUTER END PROJECTS BEYOND THE OUTER SURFACE OF THE BODY AND AN INNER END IS SUBSTANTIALLY FULLY WITHIN THE BODY, AN OUTER SLEEVE SLIDABLE LONGITUDINALLY ON THE BODY AND ADAPTED TO ENGAGE THE PROJECTING OUTER END OF THE LOCKING LUG AND FORCE SAID LUG TO A SECOND POSITION BY VIRTUE OF MOVEMENT OF THE SLEEVE TOWARD AN END OF THE BODY, WHEREBY THE OUTER END OF THE LOCKING LUG IS SUBSTANTIALLY FULLY WITHIN THE BODY AND THE 